If you're in a theater or someplace else where an unexpected call would mean embarrassment, you can turn your phone off. Sure, you could, but you're a geek. You need a better way to go off the grid. Brando's got your back with the “Black Hole Phone Bag”, a phone bag that blocks incoming and outgoing radio transmissions, effectively taking your phone off the network. Genius!
No, really, this is a real product that makes absolutely no sense, and at $12, it doesn't have to.
Black Hole phone bag [Brando]